[Occurrences and dietary exposure analysis for acaricides in the 6th Chinese total diet study]

To study the residue levels of acaricides in Chinese dietary samples and dietary intakes of Chinese residents.A total of 288 mixed dietary samples from 24 provinces in the 6 th Chinese total diet study were analyzed for residue levels of acaricides by liquid chromatography-high resolution mass spectrometry. Additionally, based on the dietary consumption of local residents, the dietary intake of acaricides was estimated.Among the tested dietary samples, the detection rates of pyridaben, spirodiclofen and propargite were 11. 8%(34/288), 8. 7%(25/288), and 6. 3%(18/288), respectively. They were mainly detected in vegetable and fruit samples. The average residue level of pyridaben in the vegetable samples was higher than that in other dietary samples with the content of 6. 26 μg/kg. The average residue level of spirodiclofen in the fruits samples was higher than that in other dietary samples with the content of 3. 92 μg/kg. The average residue level of propargite in the vegetable samples was higher than that in other dietary samples with the content of 0. 90 μg/kg. According to the dietary exposure analysis, the average dietary exposure levels of pyridaben, spirodiclofen and propargite in the general population of China were 48. 31, 1. 62 and 2. 25 ng/(kg·d), respectively. According to the dietary contribution rate, the three acaricides were mainly from vegetable samples.Although acaricides were detected in varying degrees in the Chinese dietary samples, the general populationapos;s health risk caused by the dietary intake in China is at a low level.